Shower stall



FIG. 1 is a front perspective view of a shower stall showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a cross sectional view taken on line 3--3 of FIG. 2; and,

FIG. 4 is a cross sectional view taken on line 4--4 of FIG. 2. 

The ornamental design for a shower stall, as shown and described. 